\(-\frac{x}{15}=\frac{-60}{x}\)
(=) \(\frac{x}{-15}=\frac{-60}{x}\)
(=) \(x^2=-15.-60\)
(=) \(x^2=900\)
=> \(\orbr{\begin{cases}x=30\\x=-30\end{cases}}\)
tim x biet :
x/-15=-60/x
-2/x=-x/8
tim x va y biet
x/y=17/3va x+y=60
tim x y z biet 2x=3y=4z va x+y+z=60
tim x biet
/x-15/+/x-1/=14
tim x biet
x+15+2+3=30
tim x biet :3/[x+2][x+5]+5[x+5][x+10]+7/[x+10][x+15]=x/[x+12][x+17]
Tim x biet
x/(-15)=-6/x
/ la phan so nha
tim x, biết x/-15=-60/x
tim gia tri cua x biet 0,25x=15/6:0,125.khi do x=.....
